systemd: add StateDirectory to gssproxy.service

gssproxy won't start if /var/lib/gssproxy is missing ("Failed to
create Unix Socket!"). systemd provides a directive to ensure that all
necessary state directories exist so we can use it in this case.

Signed-off-by: Alberto Garcia <berto@igalia.com>

systemd/gssproxy.service.in

@@ -5,6 +5,7 @@ After=syslog.target network.target
 Before=rpc-gssd.service
 
 [Service]
+StateDirectory=gssproxy/clients gssproxy/rcache
 Environment=KRB5RCACHEDIR=/var/lib/gssproxy/rcache
 ExecStart=@sbindir@/gssproxy -D
 # These two should be used with traditional UNIX forking daemons